Carnot Cycle Represented on a P-V Diagram

Carnot Cycle

represented on a PV Diagram.

Power Cycle

1st Law:

ΔU = Qnet - Wnet = 0
Qnet = Wnet
Qnet = QH - QC
QH - QC = Wnet
The area enclosed by the path of the cycle is the

produced by the

power cycle

.
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Ch 7, Lesson B, Page 14 - Carnot Cycle Represented on a P-V Diagram

• On a PV Diagram, the Carnot Cycle looks like a warped parallelogram.
• The area enclosed by the cycle path is equal to the net boundary work for the cycle.
• Because the state of the system moves around the cycle path in a clockwise direction, we know that the net work is positive and this cycle is a power cycle.
• The 1st Law tells us that the net work for the cycle is the difference between the amount of heat that we put in, QH, and the amount of heat rejected, QC.
• Now, let’s plot the same cycle on a TS Diagram.

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